He Yanyan, Wang Kun, Du Guangzu, Zhang Qiong, Li Bin, Zhao Lin, He Ping, Chen Bin
State Key Laboratory of Conservation and Utilization of Biological Resources of Yunnan, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China.
School of Agriculture, Yunnan University, Kunming 650500, China.
Insects. 2022 Oct 16;13(10):938. doi: 10.3390/insects13100938.
(Lepidoptera: Noctuidae) is a major pest of maize worldwide. This pest colonized maize in Shizong, Qujing, Yunnan, China in 2019. To explore the temporal and spatial distribution of in local fields, "W" type 5-point sampling was performed from 2020 to 2021. The spatial distribution was analyzed using the aggregation index, Iwao's regression, and Taylor's power law. The temporal distribution showed two peaks for both 2020 and 2021 when the density of eggs, larvae, and adults was high throughout the maize growth period. Additionally, 1st and 3rd instar larvae were higher in number during the maize seedling, jointing, and spinning stages. Fourth to 6th instar larvae were higher in number after the tasseling stage. Additionally, the spatial distribution results showed that 1st to 3rd instar larvae were aggregated, while 4th to 6th instar larvae were uniformly distributed in mountain maize fields. This study provides monitoring data for and clarifies the temporal and spatial distribution characteristics for larvae in mountain maize fields. Further, it also provides guidance for investigation into population dynamics and the development of predictive models for integrated management.
（鳞翅目：夜蛾科）是全球玉米的主要害虫。该害虫于2019年在中国云南省曲靖市师宗县侵染玉米。为探究其在当地田间的时空分布，于2020年至2021年采用“W”型五点取样法进行调查。利用聚集指数、Iwao回归和Taylor幂法则分析其空间分布。时间分布显示，2020年和2021年在玉米整个生育期卵、幼虫和成虫密度较高时均出现两个峰值。此外，在玉米苗期、拔节期和吐丝期，1龄和3龄幼虫数量较多。抽雄期后4龄至6龄幼虫数量较多。此外，空间分布结果表明，1龄至3龄幼虫呈聚集分布，而4龄至6龄幼虫在山地玉米田呈均匀分布。本研究提供了该害虫的监测数据，阐明了山地玉米田幼虫的时空分布特征。此外，还为种群动态调查和综合害虫管理预测模型的开发提供了指导。
